Backlink indexing tools compared, and the question to ask before buying one
An indexer sells you the crawling of a page it does not own. Here is what the search engines publish about that, what an indexer can honestly do, and the cheaper fix that usually works.
Published by AI Knows Us · Updated 21 October 2026
A backlink indexer is sold on a real problem. You win or pay for a link, the page exists, and months later nothing suggests the search engine has ever looked at it. An indexer offers to fix that by getting the linking page crawled. Before buying one, it is worth being precise about what the product can actually control, because the honest answer changes the purchase.
The criterion here, applied to everybody including us: what does the party that actually does the crawling publish about the process? Not what the indexer claims, but what the search engine itself writes down.
What an indexer controls and what it does not
An indexer controls one thing: it can make a URL known. It can ping it, submit it, place it where a crawler already goes, and get it into a feed. That is a real service and it is not nothing.
What it does not control is whether the engine decides the page is worth keeping. A crawl is a visit. Indexing is a decision made after the visit, by the engine, on the page's own merits, and no third party is a party to that decision. This is why the useful question to put to an indexer is not how many links it will index, but what mechanism it uses to make the URL known, and whether you could use that mechanism yourself.
The mechanisms, from the cheapest to the least pleasant
| Mechanism | What it is | Who can do it |
|---|---|---|
| Submit the URL in Search Console | Free, for any property you verify. | You, for your own pages. Not for the page that links to you, since Search Console covers only properties you verify. |
| Ask the publisher | Whoever owns the linking page can submit it themselves in seconds. | The publisher, on request. For a paid placement this is a reasonable thing to ask for and almost nobody asks. |
| A sitemap and an IndexNow style ping | The publisher's own site telling engines the page exists. | The publisher. If their site has neither, that is the real reason the page is not being crawled. |
| Link to the linking page | A crawler reaches a page by following a link to it. A page nothing points at is a page nothing walks to. | You, from a page of yours that is already crawled regularly. |
| Third party submission networks | Placing the URL across sites the vendor controls so a crawler encounters it. | The indexer. This is the part of the market where Google's own policy becomes the thing to read. |
What Google publishes about that last row
Google's spam policies page defines link spam as the practice of creating links to or from a site primarily for the purpose of manipulating search rankings, and lists among its examples using automated programs or services to create links to your site. A submission network that creates links to a page in order to get that page crawled is doing the thing described in that sentence, whatever the stated motive. That is published by the engine whose index is the point of the exercise, which makes it the only opinion with consequences.
The distinction worth holding: asking a publisher to submit their own page is a request. Creating links across sites you do not own in order to force a crawl is the activity the policy names.
The diagnosis to run before buying anything
Four checks, in this order, and most unindexed links are explained by the first two.
Is the linking page itself indexed? Search its exact title in quotes. If the page is not in the index at all, no amount of pinging your link will help, because the problem is the page and not the link.
Is the link in the rendered HTML? Load the page with scripts disabled and look. A link injected by JavaScript into a page that nothing else points at is the commonest version of this problem, and it is the publisher's to fix.
Does anything point at the linking page? If the article sits in an archive nothing links to, the page is orphaned on its own site and a crawler has no route to it. Asking the publisher to feature it, or linking to it yourself from a page of yours that gets crawled daily, is the fix.
Is the page excluded by its own site? A noindex tag, a robots rule or a canonical pointing elsewhere settles the matter and no indexer overrides any of them.
If all four come back clean, the honest conclusion is that the engine has seen the page and made a judgement about it. That is the point at which an indexer has nothing left to sell you.
Where we are not a candidate on this page, plainly
We sell no indexer, no crawler and no submission service, and we have no index of links at all. On the subject of this page we are not in the comparison, and the vendors with crawls, Ahrefs at 493 B pages with a 15 minute refresh and Semrush at more than 43 trillion backlinks refreshed at least hourly, are the ones who can tell you whether a link exists in their data. Our rendered pricing page also carries no SSO, no white label, no SOC 2 and no ISO line, and covers one business per plan outside the agency tier.
The index that has started to matter as much, and how to read it
There is a second index now deciding who gets considered, and no indexing tool touches it. When a buyer asks an assistant who to use, the assistant assembles sources, writes one answer and names two or three businesses. Getting a link crawled does nothing for that directly; being quotable on the question does. And whether it is working is a measurement rather than an assumption.
AI Knows Us asks the buyer questions you choose across ChatGPT, Gemini, Perplexity, Claude and Google AI Overviews, reports which businesses the answer named, and lists the sources behind each answer, which is the part that tells you what to publish next. The published arithmetic, from the rendered pricing page: one credit is one buyer question asked on one AI app once, most checks use one credit, a Claude check uses 3 because Claude costs more to run. The US floor is $149 a month for SEO Start, and llms.txt states that plan watches 0 buyer questions on 0 engines, so Growth at $299 is the cheapest plan reading all five surfaces.
Ahrefs runs this job too and is ahead of us on two published facts: its Brand Radar page states each prompt is checked daily on every selected platform, where ours is weekly on priority questions, and it reads AI Mode and Copilot, which we do not. Rankscale lists nine engines against our five and publishes a REST API and branding removal on shared dashboards, which we do not. Our published number is the most exact on one point only, the weight of the expensive engine, where Ahrefs publishes 8 checks per update for Claude and Rankscale publishes a flat typical 0.25 credits per engine per prompt with no per engine weight.
Most of the confusion in this part of the market comes from the words. Crawling, indexing, spidering and bots are used interchangeably in sales copy and they mean different things, which is precisely how an indexer sells the one it does not control. The vocabulary is sorted out in our piece on a web crawler, a spider, a bot and a robot, and what each name means. We measured durable inbound links ourselves on 21 October 2026, reading 2,169 stored bodies (1,797 drafts plus 372 fetched) against all 2,082 pages tracked on this site: 932 of them, 44.8% of 2,082, carry no inbound link written into another page's body. No other page on this site links to that one.
Questions buyers ask about backlink indexing tools
Can a tool force Google to index my backlink?
A tool can make a URL known. The decision to keep a page in the index is the engine's and it is made on the page itself, so the controllable part is discovery and the rest sits with the publisher and the engine.
Why are my new backlinks not indexed?
Usually because the linking page is orphaned on its own site, or the link is injected by JavaScript, or the page carries a noindex or a canonical elsewhere. Run those three checks before spending anything.
Is a backlink indexing service against Google's policy?
It depends entirely on the mechanism. Asking a publisher to submit their own page is a request. Google's spam policies page names using automated programs or services to create links to your site as an example of link spam, which is what a submission network does.
What is the free alternative?
Ask the publisher to submit the page in their own Search Console, and link to the linking page from a page of yours that is crawled often. Both are free and both address discovery, which is the part anybody can affect.
How do I know when to stop trying?
When the linking page is indexed, the link is in the rendered HTML, something points at the page and nothing excludes it. At that point the engine has seen it and formed a view, and more pinging adds nothing.